What does it mean by stop believing in fate?
It means that people should stop believing in things that are unfavorable. Most people believe that bad things happen to good people, which most them consider to be fate. Read more from http://www.thefreedictionary.com/fate.
That there is no predetermined ending for you, which is obviously wrong if we get the meaning of fate correctly.
It means you stop believing in something that is predetermined to happen in the future.